feat: add Google Serper search tool alongside Jina MCP

- Add langchain-community dependency for GoogleSerperAPIWrapper
- Add serper_api_key to config with default key
- Create app/tools/serper.py with async serper_search tool
- Register "serper" key in tools/__init__.py (independent from "search"/Jina MCP)
- Add tool title and input/output summaries in chat.py
- Set SERPER_API_KEY on Azure App Service (Operation resource group)

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/chat.py

@@ -230,6 +230,8 @@ _TOOL_TITLES: dict[str, str] = {
     "ticket_detail":     "查询工单详情",
     "generate_document": "生成文档",
     "sandbox_run":       "执行沙盒代码",
+    # Google Serper
+    "serper_search":     "Google 搜索",
     # Jina MCP tools
     "search_web":        "外部搜索",
     "read_url":          "读取网页",
@@ -262,6 +264,8 @@ def _summarize_input(tool_name: str, inp: dict | str) -> str:
             return f"第 {inp.get('page', 1)} 页，每页 {inp.get('page_size', 20)} 条"
         case "ticket_detail":
             return f"工单 ID：{inp.get('ticket_id', '')}"
+        case "serper_search":
+            return f"搜索：{str(inp.get('query', ''))[:50]}"
         case "search_web":
             return f"搜索：{str(inp.get('query', ''))[:50]}"
         case "read_url":
@@ -294,6 +298,8 @@ def _summarize_output(tool_name: str, output: str) -> str:
             return f"返回 {m.group(1)} 条工单" if m else "工单列表已获取"
         case "ticket_detail":
             return "工单详情已获取"
+        case "serper_search":
+            return f"Google 搜索完成，{len(output.splitlines())} 行结果"
         case "search_web":
             count = output.count("##")
             return f"找到 {max(count, 1)} 条搜索结果"

backend/app/config.py

@@ -44,6 +44,9 @@ class Settings(BaseSettings):
     # Jina AI (Search / Reader / Rerank)
     jina_api_key: str = ""
 
+    # Google Serper
+    serper_api_key: str = "499940576bc8a7211ac98a3f3b83a4826bb8105b"
+
     # Redis
     redis_url: str = "rediss://:bY8ZNwyJX60UwN5NPqnl6HRODfTV0efkDAzCaF1PrOU=@oper.redis.cache.windows.net:6380"
 

backend/app/tools/__init__.py

@@ -4,14 +4,17 @@ from app.tools.kb import kb_search
 from app.tools.tickets import ticket_list, ticket_detail
 from app.tools.document import generate_document
 from app.tools.sandbox import sandbox_run
+from app.tools.serper import serper_search
 
 # Mapping from frontend tool names to LangChain tool objects.
 # "search" is no longer here — it is handled via Jina MCP in chat.py.
+# "serper" uses Google Serper REST API, independent from Jina MCP.
 _TOOL_MAP: dict[str, list] = {
     "knowledge": [kb_search],
     "tickets": [ticket_list, ticket_detail],
     "document": [generate_document],
     "sandbox": [sandbox_run],
+    "serper": [serper_search],
 }
 
 

backend/app/tools/serper.py

@@ -0,0 +1,19 @@
+"""Google Serper search tool via LangChain integration."""
+
+from __future__ import annotations
+
+from langchain_community.utilities import GoogleSerperAPIWrapper
+from langchain_core.tools import tool
+
+from app.config import settings
+
+
+@tool
+async def serper_search(query: str) -> str:
+    """Search the web using Google Serper API. Returns Google search results including snippets, links, and answer boxes."""
+    try:
+        search = GoogleSerperAPIWrapper(serper_api_key=settings.serper_api_key)
+        result = await search.arun(query)
+        return result or "No results found."
+    except Exception as e:
+        return f"Serper search failed: {e}"

backend/requirements.txt

@@ -17,3 +17,4 @@ azure-storage-blob>=12.20.0
 azure-servicebus>=7.12.0
 daytona>=0.6.0
 langchain-mcp-adapters>=0.1.0
+langchain-community>=0.3.0